A soluble core precision casting mold of a topologically optimized thin-walled structure

Abstract

The utility model discloses a kind of soluble core precision casting mould of topological optimization thin-walled structure, comprising: including: mould body structure, and the forming structure being set to the inboard of mould body structure, mould body structure includes: mould base assembly, fixed assembly being set to the side surface of mould base assembly, and pedestal being set to the bottom of mould base assembly;Forming structure is set to the inboard of mould base assembly, fixed assembly is set to the side edge of mould base assembly, and fixed assembly is used to fix forming structure;Forming structure includes: cavity assembly, and the core assembly being set to the inboard of cavity assembly;Cavity assembly and core assembly are respectively clamped on mould base assembly, and core assembly and cavity assembly are used to form the inner surface and outer surface of object;Fundamentally avoid the problem, such as uneven wall thickness of casting, size out-of-tolerance even mould damage caused by core deviation, ensure the precision forming of complex thin-walled structure casting.

Description

Technical Field

[0001] This utility model relates to a precision casting mold, and more particularly to a soluble core precision casting mold with a topology-optimized thin-walled structure. Background Technology

[0002] The development of precision casting mold technology has always evolved alongside the upgrading of industrial needs. In the 1940s, to meet the manufacturing requirements of high-temperature alloy blades for aero engines, investment casting technology developed rapidly, marking the beginning of modern precision casting mold technology. Early molds were mainly made by hand finishing combined with simple machining, with forming accuracy generally at the ±0.5mm level.

[0003] In the 1960s, with the widespread application of CNC machine tools, the machining accuracy of molds broke through the ±0.1mm barrier for the first time. The electrical discharge machining (EDM) technology developed during this period solved the problem of cavity machining in cemented carbide molds, while the emergence of three-dimensional coordinate measuring machines provided a reliable means for mold accuracy inspection. The mature application of CAD / CAM technology in the 1980s completely changed the mold design and manufacturing model, making mathematical modeling of complex surfaces possible, and significantly improving mold lifespan due to the application of PVD coating technology.

[0004] Since the beginning of the 21st century, precision casting mold technology has shown a diversified development trend. In terms of materials, new mold steels such as DIEVAR and QRO90 have superior thermal fatigue properties; in terms of processes, five-axis machining centers can achieve positioning accuracy of ±0.01mm, while 3D printing technology has ushered in a new era for conformal cooling channel molds. Current research hotspots focus on multiphysics coupling simulation, nanoscale surface treatment, and intelligent operation and maintenance systems. These technologies will drive the continuous development of precision casting molds towards greater efficiency, precision, and intelligence.

[0005] Therefore, it is necessary to improve a topology-optimized thin-walled soluble core precision casting mold in the prior art to solve the above problems. Summary of the Invention

[0006] This invention overcomes the shortcomings of the prior art and provides a precision casting mold for a soluble core with a topology-optimized thin-walled structure, aiming to solve the problems in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a precision casting mold for a topology-optimized thin-walled soluble core, comprising: a mold body structure, and a forming structure disposed inside the mold body structure.

[0008] The mold structure includes: a mold base assembly, a fixing component disposed on the side of the mold base assembly, and a base disposed at the bottom of the mold base assembly; the molding structure is disposed inside the mold base assembly, and the fixing component is disposed on the side of the mold base assembly, the fixing component being used to fix the molding structure;

[0009] The molding structure includes a cavity assembly and a core assembly disposed inside the cavity assembly; the cavity assembly and the core assembly are respectively snapped onto the mold base assembly, and the core assembly and the cavity assembly are used to mold the inner and outer surfaces of the object.

[0010] In a preferred embodiment of the present invention, the mold base assembly includes an upper mold base and a lower mold base that fits into the upper mold base; both the upper mold base and the lower mold base are provided with placement grooves.

[0011] In a preferred embodiment of the present invention, the fixing component includes a horizontal fixing member and an inclined fixing member; both the horizontal fixing member and the inclined fixing member are fixed to the edge of the placement groove.

[0012] In a preferred embodiment of the present invention, the horizontal fixing member includes a base, a hydraulic cylinder disposed on one side of the base, and a pressure block slidably connected to the base; one side of the pressure block is fixedly connected to the output shaft of the hydraulic cylinder.

[0013] In a preferred embodiment of this utility model, the inclined fixing member and the horizontal fixing member have similar structures, the pressure block of the horizontal fixing member is vertically arranged, and the pressure block of the inclined fixing member is inclined.

[0014] In a preferred embodiment of this utility model, the base is hollowed out in the middle, and a locking device is rotatably connected to the middle of the base. The locking device is in the shape of a horizontally arranged C.

[0015] In a preferred embodiment of this utility model, the cavity assembly is designed as the outer surface of an object, and the side of the cavity assembly can be engaged with the placement groove of the upper mold base.

[0016] In a preferred embodiment of the present invention, the core assembly includes a fixed disk, a connecting disk connected to the fixed disk, and a positioning element for positioning the fixed disk and the connecting disk.

[0017] In a preferred embodiment of this utility model, a pad is also provided on the side of the fixed plate. The pad is used to fix the position of the fixed plate. Positioning holes are provided on both the fixed plate and the connecting plate. Several connecting holes are also provided on the fixed plate.

[0018] In a preferred embodiment of this utility model, a plurality of connecting shafts are provided at the bottom of the connecting plate, and the connecting shafts fit into the connecting holes.

[0019] This utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0020] (1) This utility model provides a precision casting mold for a topology-optimized thin-walled structure with a soluble core. By setting horizontal fixing parts (vertical pressure block) and inclined fixing parts (inclined pressure block) at different angles, both of which include hydraulic cylinders driving the pressure blocks to slide on the base, the hydraulic cylinders drive the two sets of pressure blocks to apply extrusion force to the fixing plate of the core assembly from the horizontal and inclined angles respectively. This multi-angle coordinated clamping design can apply constraint force to the core assembly in both the vertical and horizontal planes, effectively overcoming the displacement risk caused by changes in casting pressure and temperature. Compared with the single-direction or coarse fixing methods in the prior art, this design significantly improves the positioning rigidity and stability of the core assembly on the mold base (especially the lower mold base), fundamentally avoiding problems such as uneven casting wall thickness, dimensional deviations, and even mold damage caused by core offset, and ensuring the precision forming of complex thin-walled structure castings.

[0021] (2) This utility model provides a precision casting mold for a topology-optimized thin-walled structure with a soluble core. The mold uses horizontal and inclined fixing components on the mold base assembly, as well as rotating clamps on the base, for multi-directional and high-precision fixing and positioning. After casting, simply immersing the mold in water causes the core assembly to dissolve and disappear, allowing the topology-optimized thin-walled casting to automatically detach due to the loss of its internal support. Compared to the mechanical ejection or hammering methods commonly used in the prior art for forced demolding, this method completely eliminates the physical damage (such as deformation and fracture) that may be caused to castings with complex structures and extremely thin walls during demolding. In particular, it solves the key problem of topology-optimized thin-walled parts being difficult to demold without damage due to their geometric complexity and structural fragility, significantly improving yield and product quality. (3) Description of the attached drawings

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0023] Figure 1 This is a perspective structural diagram of a preferred embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the disassembled structure of a preferred embodiment of the present invention;

[0025] In the diagram: 1. Mold structure; 10. Upper mold base; 11. Lower mold base; 12. Fixing component; 13. Horizontal fixing component; 14. Inclined fixing component; 15. Hydraulic cylinder; 16. Base; 17. Pressure block; 18. Clamping component; 19. Base; 2. Molding structure; 20. Placement groove; 21. Fixing plate; 22. Connecting plate; 23. Pad; 24. Connecting hole; 25. Positioning component; 3. Pull ring. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0027] The mold in this application is specifically a soluble core precision casting mold designed for topology-optimized thin-walled structures. The purpose of this mold is to effectively prevent product damage during the demolding process of such thin-walled structures. The topology-optimized thin-walled structure is the original thin-walled structure that has undergone topology optimization. Through topology optimization, redundant parts are removed while ensuring the required main performance of the structure, namely maximum strength or minimum weight, to form an efficient connection path. The formed connection path ensures the stability of the structure under continuous deformation while ensuring the required main performance.

[0028] As shown in the figure, a precision casting mold for a topology-optimized thin-walled soluble core includes: a mold body structure 1, and a forming structure 2 disposed inside the mold body structure 1.

[0029] The mold structure 1 includes: a mold base assembly, a fixing component 12 disposed on the side of the mold base assembly, and a base 19 disposed at the bottom of the mold base assembly; the molding structure 2 is disposed inside the mold base assembly, and the fixing component 12 is disposed on the side of the mold base assembly, and the fixing component 12 is used to fix the molding structure 2.

[0030] The molding structure 2 includes a cavity assembly and a core assembly disposed inside the cavity assembly; the cavity assembly and the core assembly are respectively snapped onto the mold base assembly, and the core assembly and the cavity assembly are used to mold the inner surface and outer surface of the object.

[0031] It should be noted that this application specifically relates to a precision casting mold for a topology-optimized thin-walled structure with a soluble core. By separately setting a cavity component and a core component, and by changing the composition of the core component, the core component can achieve a water-soluble effect. Specifically, it is a salt-based composite material with NaCl as the matrix and aluminum silicate added. It can withstand temperatures above 600°C, but it will dissolve when it comes into contact with water. After the topology thin-walled structure is injection molded, the core component is hydrolyzed, thereby causing the injection molded item to automatically detach and effectively avoid damage to the injection molded product.

[0032] The mold structure 1 includes: a mold base assembly, a fixing component 12 disposed on the side of the mold base assembly, and a base 19 disposed at the bottom of the mold base assembly; a molding structure 2 is disposed inside the mold base assembly, and the fixing component 12 is disposed on the side of the mold base assembly, the fixing component 12 being used to fix the molding structure 2; the mold base assembly includes an upper mold base 10 and a lower mold base 11 that fits into the upper mold base 10; both the upper mold base 10 and the lower mold base 11 are provided with placement grooves 20. A pull ring 3 is also fixedly connected to the top of the upper mold base 10; the fixing component 12 includes a horizontal fixing member 13 and an inclined fixing member 14; both the horizontal fixing member 13 and the inclined fixing member 14 are fixed at the edge of the placement groove 20. The horizontal fixing member 13 includes a base 16, a hydraulic cylinder 15 disposed on one side of the base 16, and a pressure block 17 slidably connected to the base 16; one side of the pressure block 17 is fixedly connected to the output shaft of the hydraulic cylinder 15. The inclined fastener 14 and the horizontal fastener 13 have similar structures. The pressure block 17 of the horizontal fastener 13 is vertically arranged, while the pressure block 17 of the inclined fastener 14 is inclined. The base 19 has a hollowed-out shape in the middle, and a clamping piece 18 is rotatably connected to the middle of the base 19. The clamping piece 18 is a horizontally arranged C-shape.

[0033] It should be noted that the base 19 is hollowed out in the middle. A clip 18 is rotatably connected to the middle of the hollowed-out part at the bottom of the base 19. The clip 18 is horizontally C-shaped, with its opening facing the upper mold base 10 and the lower mold base 11. A positioning hole is also provided on the lower mold base 11 directly above the clip 18. The cavity assembly and the core assembly are perfectly matched during the injection molding process through the combined cooperation of the positioning hole, the connecting hole 24 and the fixing component 12, effectively avoiding positional deviation.

[0034] The fixing component 12 includes a horizontal fixing member 13 and an inclined fixing member 14. The horizontal fixing member 13 is horizontally arranged to fix the horizontal position of the core component, while the inclined fixing member 14 is inclined. The horizontal fixing member 13 and the inclined fixing member 14 have the same structure, both consisting of a base 16, a hydraulic cylinder 15, and a pressure block 17. The base 16 is fixedly connected to the edges of two adjacent sides of the lower mold base 11. In use, the hydraulic cylinder 15 pushes the pressure block 17 to slide forward on the base 16, thereby squeezing the core component through the two pressure blocks 17 at different angles, thus completely fixing the core component to the lower mold base 11 in both the vertical and horizontal planes.

[0035] The molding structure 2 includes a cavity assembly and a core assembly disposed inside the cavity assembly; the cavity assembly and the core assembly are respectively snapped onto the mold base assembly, and the core assembly and the cavity assembly are used to mold the inner surface and outer surface of the object.

[0036] In this invention, the cavity assembly is designed to resemble the outer surface of an object, and its side can engage with the placement groove 20 of the upper mold base 10. The core assembly includes a fixed plate 21, a connecting plate 22 connected to the fixed plate 21, and positioning elements 25 for positioning the fixed plate 21 and the connecting plate 22. A pad 23 is also provided on the side of the fixed plate 21 to fix its position. Positioning holes are provided on both the fixed plate 21 and the connecting plate 22, and several connecting holes 24 are also provided on the fixed plate 21. Several connecting shafts are provided at the bottom of the connecting plate 22, and the connecting shafts engage with the connecting holes 24.

[0037] It should be noted that the cavity assembly can be snapped into the upper mold assembly on its side, thus enabling this mold structure 1 to be compatible with most molds. By snapping together the cavity assembly and the core assembly, it can be used with most thin-walled molds. The core assembly includes a fixed plate 21, a connecting plate 22, and a positioning member 25. The positioning member 25 is T-shaped, and the upper half of the positioning member 25 is embedded in the connecting plate 22. The fixed plate 21 is snapped into the placement groove 20 of the lower mold base 11 and is fixed in multiple directions by horizontal fixing members 13 and inclined fixing members 14. When injection molding smaller objects, a pad 23 is placed in the placement groove 20 on the opposite side of the inclined fixing member 14 to reduce the size of the placement groove 20, thereby allowing the fixed plate 21 with denser and smaller connecting holes 24 to be placed. It is also fixed by horizontal fixing members 13 and inclined fixing members 14. Then, the connecting shaft at the bottom of the connecting plate 22 connects the bottom of the connecting plate 22. The connecting shaft is inserted into the corresponding connecting hole 24 to fix the connecting plate 22 onto the fixed plate 21. At this time, the positioning holes of the connecting plate 22, the fixed plate 21, and the lower mold base 11 are aligned. Then, the T-shaped positioning piece 25 is lowered to completely fix the core assembly onto the lower mold base 11 and make its position completely match the upper mold base 10. Then, the clamping piece 18 is rotated. A snap-fit ​​groove that matches the clamping piece 18 is opened at the bottom of the positioning piece 25. By rotating the clamping piece 18, the clamping piece 18 and the bottom of the positioning piece 25 are completely snapped together, and the positioning piece 25 is completely positioned. Several connecting holes 24 are also provided above the connecting plate 22. The connecting holes 24 are used to connect the core part for injection molding. The core part is 3D printed and its bottom is also provided with several connecting shafts. The core part is fixed onto the connecting plate 22 by the connecting shafts. Then, the upper mold base 10 is lowered by controlling the pull ring 3 to make the cavity assembly and the core assembly completely match, and then the injection molding operation is performed.

[0038] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A precision casting mold for a topology-optimized thin-walled soluble core, comprising: The mold structure (1) and the molding structure (2) disposed inside the mold structure (1) are characterized in that; The mold structure (1) includes: a mold base assembly, a fixing component (12) disposed on the side of the mold base assembly, and a base (19) disposed at the bottom of the mold base assembly; the molding structure (2) is disposed inside the mold base assembly, and the fixing component (12) is disposed on the side of the mold base assembly, and the fixing component (12) is used to fix the molding structure (2). The molding structure (2) includes: a cavity assembly and a core assembly disposed inside the cavity assembly; the cavity assembly and the core assembly are respectively snapped onto the mold base assembly, and the core assembly and the cavity assembly are used to mold the inner surface and outer surface of the object.

2. The precision casting mold for a topology-optimized thin-walled structure soluble core according to claim 1, characterized in that: The mold base assembly includes an upper mold base (10) and a lower mold base (11) that fits into the upper mold base (10); both the upper mold base (10) and the lower mold base (11) are provided with placement grooves (20), and a pull ring (3) is fixedly connected to the top of the upper mold base (10).

3. The precision casting mold for a topology-optimized thin-walled structure soluble core according to claim 2, characterized in that: The fixing component (12) includes a horizontal fixing member (13) and an inclined fixing member (14); both the horizontal fixing member (13) and the inclined fixing member (14) are fixed to the edge of the placement groove (20).

4. The precision casting mold for a topology-optimized thin-walled structure soluble core according to claim 3, characterized in that: The horizontal fixing member (13) includes a base (16), a hydraulic cylinder (15) disposed on one side of the base (16), and a pressure block (17) slidably connected to the base (16); one side of the pressure block (17) is fixedly connected to the output shaft of the hydraulic cylinder (15).

5. The precision casting mold for a topology-optimized thin-walled structure soluble core according to claim 4, characterized in that: The inclined fastener (14) and the horizontal fastener (13) have similar structures. The pressure block (17) of the horizontal fastener (13) is vertically arranged, while the pressure block (17) of the inclined fastener (14) is inclined.

6. The precision casting mold for a topology-optimized thin-walled structure soluble core according to claim 1, characterized in that: The base (19) is hollow in the middle, and a clip (18) is rotatably connected in the middle of the base (19). The clip (18) is in the shape of a horizontally arranged C.

7. The precision casting mold for a topology-optimized thin-walled structure soluble core according to claim 2, characterized in that: The cavity assembly is designed to resemble the outer surface of an object, and the side of the cavity assembly can be engaged with the placement groove (20) of the upper mold base (10).

8. The precision casting mold for a topology-optimized thin-walled structure with a soluble core according to claim 1, characterized in that: The core assembly includes a fixed disk (21), a connecting disk (22) connected to the fixed disk (21), and a positioning element (25) for positioning the fixed disk (21) and the connecting disk (22).

9. A precision casting mold for a topology-optimized thin-walled structure with a soluble core according to claim 8, characterized in that: The fixed plate (21) is also provided with a pad (23) on its side. The pad (23) is used to fix the position of the fixed plate (21). The fixed plate (21) and the connecting plate (22) are both provided with positioning holes. The fixed plate (21) is also provided with several connecting holes (24).

10. A precision casting mold for a topology-optimized thin-walled structure with a soluble core according to claim 9, characterized in that: The bottom of the connecting plate (22) is provided with several connecting shafts, which fit into the connecting holes (24).

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